Basically what I need is to find everyone who hasn't paid AND has no matching entry where they actually did pay. What i've been trying to come up with then, is coming up with a query that finds ...

Figure E Power Query displays a unique set of records. As you can see in Figure E, the Find Duplicates column returns the value 2 if the record has a duplicate.

The Find Duplicates Query wizard handles this chore quickly and easily. When maintaining an Access database, it’s a good idea to regularly remove duplicate records.